Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,572,668
Beginning Balance at Dec. 31, 2019	$ 292,800	$ 116	$ 88,399	$ 212,553	$ (8,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	7,930			7,930
Other comprehensive income, net of tax	276				276
Employee stock purchase plan (in shares)		27,104
Employee stock purchase plan	1,112		1,112
Stock options exercised (in shares)		1,569
Stock options exercised	39		39
Stock awards vested (in shares)		86,523
Stock awards vested	0	$ 1	(1)
Stock repurchased related to the exercise of stock options and stock awards vested (in shares)		(39,247)
Stock repurchased related to the exercise of stock options and stock awards vested	(2,009)	$ (1)	(2,008)
Stock-based compensation	2,279		2,279
Ending Balance (in shares) at Mar. 28, 2020		11,648,617
Ending Balance at Mar. 28, 2020	302,427	$ 116	89,820	220,483	(7,992)
Beginning Balance at Dec. 31, 2019	292,800	$ 116	88,399	212,553	(8,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	13,020
Other comprehensive income, net of tax	540
Ending Balance (in shares) at Jun. 27, 2020		11,683,131
Ending Balance at Jun. 27, 2020	309,607	$ 117	91,645	225,573	(7,728)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,648,617
Beginning Balance at Mar. 28, 2020	302,427	$ 116	89,820	220,483	(7,992)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	5,090			5,090
Other comprehensive income, net of tax	264				264
Employee stock purchase plan	0
Stock options exercised (in shares)		9,201
Stock options exercised	231		231
Stock awards vested (in shares)		45,363
Stock awards vested	0	$ 1	(1)
Stock repurchased related to the exercise of stock options and stock awards vested (in shares)		(20,050)
Stock repurchased related to the exercise of stock options and stock awards vested	(655)		(655)
Stock-based compensation	2,250		2,250
Ending Balance (in shares) at Jun. 27, 2020		11,683,131
Ending Balance at Jun. 27, 2020	309,607	$ 117	91,645	225,573	(7,728)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,683,131
Beginning Balance (in shares)		11,728,212
Beginning Balance at Dec. 31, 2020	329,334	$ 117	97,090	241,727	(9,600)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	6,695			6,695
Other comprehensive income, net of tax	245				245
Employee stock purchase plan (in shares)		31,580
Employee stock purchase plan	1,558		1,558
Stock options exercised (in shares)		17,872
Stock options exercised	610		610
Stock awards vested (in shares)		178,827
Stock awards vested	0	$ 2	(2)
Stock repurchased related to the exercise of stock options and stock awards vested (in shares)		(106,894)
Stock repurchased related to the exercise of stock options and stock awards vested	(6,005)	$ (1)	(6,004)
Stock-based compensation	3,133		3,133
Ending Balance (in shares) at Apr. 03, 2021		11,849,597
Ending Balance at Apr. 03, 2021	335,570	$ 118	96,385	248,422	(9,355)
Beginning Balance at Dec. 31, 2020	329,334	$ 117	97,090	241,727	(9,600)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	15,118
Other comprehensive income, net of tax	490
Ending Balance (in shares) at Jul. 03, 2021		11,894,807
Ending Balance at Jul. 03, 2021	345,470	$ 119	97,616	256,845	(9,110)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,849,597
Beginning Balance at Apr. 03, 2021	335,570	$ 118	96,385	248,422	(9,355)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	8,423			8,423
Other comprehensive income, net of tax	245				245
Employee stock purchase plan	0
Stock options exercised (in shares)		13,655
Stock options exercised	510		510
Stock awards vested (in shares)		65,181
Stock awards vested	0	$ 1	(1)
Stock repurchased related to the exercise of stock options and stock awards vested (in shares)		(33,626)
Stock repurchased related to the exercise of stock options and stock awards vested	(1,887)		(1,887)
Stock-based compensation	2,609		2,609
Ending Balance (in shares) at Jul. 03, 2021		11,894,807
Ending Balance at Jul. 03, 2021	$ 345,470	$ 119	$ 97,616	$ 256,845	$ (9,110)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,894,807